I second the suggestion of FloppyEmu support for the Apple IIgs.
Also, in the late 1990s directly before the introduction of the Power Macintosh G3 Blue-and-White (or maybe right after) MacWorld had an issue about servers, and one of the feature articles was a series of review about ADB dongles that would look for a heartbeat in the system and reboot it if the system or a particular app hung.
There were also ADB power strips that had more advanced functionality, such as scheduling. http://www.sophisticated.com/products/powercontrol.html
A modern reimplementation of something like that could be pretty neat, for scheduled reboots on a Mac that's doing server tasks, for example. (Although, presuming your server app doesn't manage to bring down the system, you could almost just do that one purely in software, so that may not really be that exciting.)
Also, in the late 1990s directly before the introduction of the Power Macintosh G3 Blue-and-White (or maybe right after) MacWorld had an issue about servers, and one of the feature articles was a series of review about ADB dongles that would look for a heartbeat in the system and reboot it if the system or a particular app hung.
There were also ADB power strips that had more advanced functionality, such as scheduling. http://www.sophisticated.com/products/powercontrol.html
A modern reimplementation of something like that could be pretty neat, for scheduled reboots on a Mac that's doing server tasks, for example. (Although, presuming your server app doesn't manage to bring down the system, you could almost just do that one purely in software, so that may not really be that exciting.)